Question

Which sentence describes the action of natural selection? An ecosystem contains two types of giraffes, some with short necks and others with long necks. The distribution of this trait is equal among the population. A disease causes low-lying shrubs to die out. The long-necked giraffes can access more food, so they have a better chance of surviving to reproductive age. After several generations, all the giraffes have long necks.
ANSWER: The long-necked giraffes can access more food, so they have a better chance of surviving to reproductive age.

Answer 1

Answer: The long-necked giraffes can access more food, so they have a better chance of surviving to reproductive age.

Explanation:

Natural selection is the process of differential survival and further facilitate in reproduction. Here, the organisms which have suitable phenotypic traits exhibit better chances of survival and reproduction over others.  

According to the given situation, the long-necked giraffes will be able to fetch more food than short necked giraffe. As they have phenotypic advantage of long neck which will help them to reach long tree canopy. They will derive food and hence, their chances of survival and reproduction will be more than the short necked giraffes.

Answer 2

The long-necked giraffes can access more food, so they have a better chance of surviving to reproductive age.